00:01
So to find d zd t, we will want to take dzdx times dx dx d t plus d zdy y times d y d t.
00:21
So solving for d z d x we get that that is going to be 1 over 2x squared plus y and sorry it should be 4x and then d x d t is equal.
00:50
To 1 half, t to the negative half.
00:57
Now, d z, d, y, is equal to 1 over 2x squared plus y, and d, y, d, t, is equal to 2 thirds, t to the negative one -third.
01:23
And i'm going to scroll down for a moment so that we can calculate all this up.
01:29
So d, z, d, t, is equal to 4x over 2x squared plus y, it's one half, t to the negative one half plus one over two x squared plus y times two -thirds, t to the negative one -third...